CVE-2026-91777
Forward-reference completion for @JsonIdentityInfo object IDs in FasterXML jackson-databind performs a linear scan of the pending-reference accumulator for every resolved ID. The affected paths are CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference() and the equivalent implementation in MapDeserializer.
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When a document first creates N unresolved object-ID references in an identity-enabled collection or map and then defines those same IDs in reverse order, completion performs on the order of N * (N + 1) / 2 identity comparisons, so a shallow document whose size grows linearly causes quadratic CPU work during deserialization. The reporter instrumented equals() calls on the ID class and measured exactly 2,003,000 comparisons at N = 2,000, against zero comparisons in the pending-reference lookup path for an equally sized control in which every reference was already resolved. The input requires no deep nesting and no syntactically unusual JSON. Exploitation requires an application that deserializes attacker-influenced JSON into an identity-enabled collection or map. The fix replaces the repeated linear lookup with a keyed pending-reference structure.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.45%
- Percentil entre todas las CVEs puntuadas: 37
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access85 % - Impacto principal
T1499.004Application or System Exploitationimpact90 %
Vulnerabilidad de DoS por complejidad algorítmica cuadrática en deserialización JSON expuesta a nivel de red (AV:N, PR:N). Requiere JSON malformado con referencias circulares en colecciones con @JsonIdentityInfo.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-400
Referencias
JSON original (NVD)
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{
"id": "CVE-2026-91777",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-91777",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-09-23T14:04:51.226591Z"
}
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"affectedData": [
{
"repo": "https://github.com/FasterXML/jackson-databind",
"vendor": "FasterXML",
"product": "jackson-databind",
"versions": [
{
"status": "affected",
"version": "2.5.0",
"versionType": "maven",
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},
{
"status": "affected",
"version": "2.19.0",
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"lessThanOrEqual": "2.21.6"
},
{
"status": "affected",
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],
"packageName": "com.fasterxml.jackson.core:jackson-databind",
"collectionURL": "https://repo1.maven.org/maven2",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference"
},
{
"name": "com.fasterxml.jackson.databind.deser.std.MapDeserializer.MapReferringAccumulator.resolveForwardReference"
}
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},
{
"repo": "https://github.com/FasterXML/jackson-databind",
"vendor": "FasterXML",
"product": "jackson-databind",
"versions": [
{
"status": "affected",
"version": "3.0.0",
"versionType": "maven",
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},
{
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"version": "3.2.0",
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}
],
"packageName": "tools.jackson.core:jackson-databind",
"collectionURL": "https://repo1.maven.org/maven2",
"defaultStatus": "unaffected",
"programRoutines": [
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},
{
"name": "tools.jackson.databind.deser.jdk.MapDeserializer.MapReferringAccumulator.resolveForwardReference"
}
]
}
]
}
],
"published": "2026-09-23T03:17:04.783",
"references": [
{
"url": "https://github.com/FasterXML/jackson-databind/issues/6204",
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c"
},
{
"url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-cxp5-3px4-pw24",
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c"
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{
"url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-cxp5-3px4-pw24",
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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],
"vulnStatus": "Deferred",
"weaknesses": [
{
"type": "Secondary",
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"description": [
{
"lang": "en",
"value": "CWE-400"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Forward-reference completion for @JsonIdentityInfo object IDs in FasterXML jackson-databind performs a linear scan of the pending-reference accumulator for every resolved ID. The affected paths are CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference() and the equivalent implementation in MapDeserializer. When a document first creates N unresolved object-ID references in an identity-enabled collection or map and then defines those same IDs in reverse order, completion performs on the order of N * (N + 1) / 2 identity comparisons, so a shallow document whose size grows linearly causes quadratic CPU work during deserialization. The reporter instrumented equals() calls on the ID class and measured exactly 2,003,000 comparisons at N = 2,000, against zero comparisons in the pending-reference lookup path for an equally sized control in which every reference was already resolved. The input requires no deep nesting and no syntactically unusual JSON. Exploitation requires an application that deserializes attacker-influenced JSON into an identity-enabled collection or map. The fix replaces the repeated linear lookup with a keyed pending-reference structure."
}
],
"lastModified": "2026-09-24T20:43:32.537",
"sourceIdentifier": "36c7be3b-2937-45df-85ea-ca7133ea542c"
}